package com.zhishu.system.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.bind.annotation.RequestMapping;

@org.springframework.stereotype.Controller
public class VerifyCodeAction {

	private static final org.apache.log4j.Logger logger = org.apache.log4j.Logger
			.getLogger(VerifyCodeAction.class);

	@RequestMapping("/verify/verifyCode")
	public void verifyCode(HttpServletRequest httpRequest,
			HttpServletResponse httpResponse) throws IOException {
		try {
			httpResponse.setHeader("Pragma", "No-cache");
			httpResponse.setHeader("Cache-Control", "no-cache");
			httpResponse.setDateHeader("Expires", 0);
			// 在内存中创建图象
			int width = 60, height = 25;
			BufferedImage image = new BufferedImage(width, height,
					BufferedImage.TYPE_INT_RGB);
			// 获取图形上下文
			Graphics g = image.getGraphics();
			// 生成随机类
			Random random = new Random();
			// 设定背景色
			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, height);
			// 设定字体
			g.setFont(new Font("Times New Roman", Font.PLAIN, 25));
			// 画边框
			// g.setColor(new Color());
			// g.drawRect(0,0,width-1,height-1);
			// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
			g.setColor(getRandColor(160, 200));
			for (int i = 0; i < 155; i++) {
				int x = random.nextInt(width);
				int y = random.nextInt(height);
				int xl = random.nextInt(12);
				int yl = random.nextInt(12);
				g.drawLine(x, y, x + xl, y + yl);
			}
			// 取随机产生的认证码
			String ssource = "123456789abcdefghigklmnopqrstuvwxyz";
			String sRand = "";
			for (int i = 0, rnd = 0; i < 4; i++) {
				rnd = Math.abs(random.nextInt()) % ssource.length();
				String rand = "" + ssource.charAt(rnd);
				sRand += ssource.charAt(rnd);
				// 将认证码显示到图象中
				g.setColor(new Color(20 + random.nextInt(110), 20 + random
						.nextInt(110), 20 + random.nextInt(110)));// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
				g.drawString(rand, 13 * i + 6, 20);
			}
			// 将认证码存入SESSION
			httpRequest.getSession().setAttribute(UserSession.verifyCode, sRand);// HttpSessionConstant.USERLOGIN_VERIFYCODE_KEY
			// 图象生效
			g.dispose();
			// 输出图象到页面
			ImageIO.write(image, "JPEG", httpResponse.getOutputStream());
		} catch (Exception e) {
			logger.error("获取验证码异常", e);
		}

	}

	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

}
